Question

The average (mean) of 90 numbers is 60, and the average of 60 numbers is 90. What is the average of all the numbers?

Answer 1

Answer: Average = 72

Explanation:

Average of 90 nos. = 60

Total score = 90 x 60 = 5400

Average score of 60 nos is 90

Total score = 60 x 90 = 5400

Average of all nos

= (5400 + 5400) / 150 = 72